I have working hardware from every decade, oldest is from 1982, but my daily driver and what I'm typing on now is a 2019 iMac 5K and Apple still doesn't have anything all-in-one to replace it. My keyboard is from 2002 (the USB version of the Kinesis I bought in ~ 1993).

My oldest computer still in 24/7 use is my 2014 FreeNAS, but it's using a monitor that's so old I don't even know.

Old hardware is great, but I do appreciate just how much better LCD panels have gotten over time.